Add release note update

Signed-off-by: Ryan Liang <[email protected]>

release-notes/opensearch-observability.release-notes-2.17.0.0.md

@@ -24,6 +24,7 @@ Compatible with OpenSearch and OpenSearch Dashboards version 2.17.0
 * [query assist] update api handler to accommodate new ml-commons config response ([#2111](https://github.com/opensearch-project/dashboards-observability/pull/2111))
 * Update trace analytics landing page ([#2125](https://github.com/opensearch-project/dashboards-observability/pull/2125))
 * [query assist] update ml-commons response schema ([#2124](https://github.com/opensearch-project/dashboards-observability/pull/2124))
+* [MDS] Add support for register data sources during the absence of local cluster ([#2140](https://github.com/opensearch-project/dashboards-observability/pull/2140))
 
 ### Bug Fixes
 * [Bug] Trace Analytics bug fix for local cluster being rendered ([#2006](https://github.com/opensearch-project/dashboards-observability/pull/2006))